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EDG Data Set Name	Granule Shortname
MODIS/Aqua Surface Reflectance Quality Daily L2G Global 1km SIN Grid	MYD09GST

Version	Acquisition Range	Science Quality Status
V003	March 6 2003 (2003065) - February 1 2004 (2004032)	Provisional
V004	July 4 2002 (2002185)	Validated Stage 1 as of July 4, 2002

Data Set Characteristics Area = ~ 10° x 10° lat/long Image Dimensions = 2 (1200x1200 row/column) Average File Size = 9 MB Resolution = ~1000 meters Projection = Sinusoidal Data Format = HDF-EOS Science Data Sets (SDSs) = 3	Product Description The MODerate-resolution Imaging Spectroradiometer (MODIS) Surface Reflectance products are computed from bands 1-7 to provide an estimate of the surface spectral reflectance for each band as it would be measured at ground level in the absence of atmospheric scattering or absorption. A correction scheme identifies atmospheric gases, aerosols, and thin cirrus clouds. The MODIS/Aqua Surface Reflectance State Daily L2G Global 1km SIN Grid product, MYD09GST, is a restructured version of the quality data in level-2 surface reflectance. MYD09GST summarizes the quality of the MYD09 products, including atmospheric and other correction states. The product specifically contains information pertaining to cloud and cloud shadow, land and water designations, aerosols, and the data source of corrections performed on the file. MYD09GST contains three Science Data Sets (SDSs); reflectance data state quality assurance, the number of observations, and observation coverage for each pixel.
The true-color RGB image above is 500m Surface Reflectance over the Arabian Peninsula acquired February 13, 2004.  The corresponding pseudo-colored MYD09GST shows the land/water state of 1km MYD09 data, as described by the legend below.  The image in the bottom right is a subset of the lower left corner of the MYD09GST, and emphasizes the detail with which the land water state is displayed. black..........fill green..........land yellow........ephemeral water dark blue...deep inland water light blue....shallow inland water purple........coastlines/shorelines med. blue...shallow-moderate ocean

NOTE: These products are provisional, meaning that product quality may not be optimal. Incremental product improvements are still occurring, and users are urged to contact MODIS Science Team representatives prior to use of the data in publications. These data are likely to be replaced when the validated product becomes available.

SDS	Units	Data Type-bit	Fill Value	Valid Range
*1km Reflectance Data State QA	Bit field	16-bit unsigned integer	65535	0 - 57335
Orbit and coverage	Bit field	8-bit unsigned integer	15	0 – 255
Number of Observations	na	8-bit signed integer	-1	0 - 127

*MODIS Surface Reflectance QA Science Data Sets

View a Version Formatted for Printing

Retrieve the MYD09GSTv4 MODIS product through the LP DAAC Data Pool
Via Search Tool: http://e4eil01u.ecs.nasa.gov:22000/WebAccess/drill?attrib=esdt&esdt=MYD09GST.4&group=MOLA
Via FTP Directory: ftp://e4ftl01u.ecs.nasa.gov/MOLA/MYD09GST.004/

Order These Data through the EOS Data Gateway
MODIS/AQUA SURFACE REFLECTANCE QUALITY DAILY L2G GLOBAL 1KM SIN GRID V004

EOS Data Gateway Search Tips

Source:	Aqua
Sensor:	MODIS
Dataset:	MODIS/Aqua Surface Reflectance Quality Daily L2G Global 1km SIN Grid
Spatial:	HORIZONTALTILENUMBER Max/Min VERTICALTILENUMBER Max/Min
Geographic Extent:	Type Lat/Long Range or Draw on Map
Temporal Extent:	2003-03-06 to 2004-02-01 (V003); 2002-07-04 to present (V004)

Product Information

Product Description (http://landval.gsfc.nasa.gov/MODLAND/surfrad.htm)

User Guide (http://modis-sr.ltdri.org/html/surfref.htm)

Algorithm Theoretical Basis Document(ATBD) (http://modis.gsfc.nasa.gov/data/atbd/land_atbd.php)

MODIS Standard Data Products Catalog (http://modis.gsfc.nasa.gov/data/dataprod/index.php)

EOS Data Products Handbook Volume 2 (2000) (http://eospso.gsfc.nasa.gov/eos_homepage/for_scientists/data_products/vol2.php)

Contact Information

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Phone:	605-594-6116
Toll Free:	866-573-3222
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Fax:	605-594-6963
Email:	LPDAAC@eos.nasa.gov
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